<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>布局测试</title>
    <style type="text/css">
        html,body{
            height: 100vh;
            padding: 0;
            margin: 0;
        }
        body {
            height: 100vh;
            display: flex;
        }
        aside {
            flex: none;
            width: 200px;
            overflow-y: auto;
            display: block;
            background-color: #00c4ff;
        }
        .content {
            flex: auto;
            display: flex;
            flex-direction: column;
            overflow-y: auto;
            background-color: #00d95a;
        }
        .content article {
            flex: auto;
            background-color: #9effff;
            height: 100%;
            overflow-y: auto;
        }
    </style>
</head>
<body>
<aside>
    ASIDE
    <p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p><p>item</p>

</aside>
<div class="content">
    <header>HEADER</header>
    <article>CONTENT

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    </article>
    <footer>FOOTER</footer>
</div>
</body>
</html>
